Screw-threading machine.



No. 890,848. Y PATEiN-TED JUNE 16, 1908.

J. o. DIXON L E. s. MUMMBRTi SCREW THREADING MACHINE. APPLIoATIoN FILEDJAN. 17. 1907.

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No. 890,848. PATENTED JUNE 16, 1908. -J. 0. DIXON & E. S. MUMMERT.

SCREW THREADING MACHINE.

APPLICATION FILED JAN. 17. 1907.

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t 1)* l Il No. 890,848. lATENTED JUNE 16, 1908.

J. 0. DIXON & E. S. MUMMERT. SCREW THREADING MACHINE.

APPLICATION FILED JAN. 17. 1907.

6 SHEETS-SHEBT 3.

No. 880,848. i `'88881813813 JUNE 18, 1908.

J. 0. DIXON & E. S. MUMMERT. SCREW THREADING MACHINE.

APPLICATION vIILIEII) JAN.17. 1907.

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No. 890,848. PATENTEI) .TUNE 16, 1908. J. 0. DIXON & E. S. MUMMERT.SCREW THREADING MACHINE.

APPLIOTION FILED JAN.1'7. 1907.

5 SHEETS-SHEET 5.

UNITED sTArEs PATENT oEEIoE.

JOSEPH O. DIXON AND ERVIN S. MUMMERT, OF HANOVER, PENNSYLVANIA,ASSIGNORS TO MUMMERT, WOLF & DIXON OO., OF HANOVER, PENNSYLVANIA, AFIRM.

SCREW-THREADING MACHINE. y

Specification of Letters Patent.

Patented June 1c, 1908.

A Application filed January i7, 1.907. Serial No. 352,767.

, States, and-residents of Hanover, in the county of York and State ofPennsylvania, have invented certain Improvements in Screw- ThreadinMachines, of which the following is aspeci cation.

The principal objects of our invention are to provide a screw threadingmachine for the pur ose of threading bolts, rods, etc., which sha besimple and compact in construction, positive and automatic initsoperation, and which may be easily adjusted to operate upon rods orbolts Vof different sizes. and producey threads of different lengths andvarying depths. 1 j Other though minor objects of the invention willhereinafter appear, and what we claim as novel in the particularconstruction and combination of parts will be hereinafter specificallyset forth in the appended claims.

In the accompanying drawings, which form a art of this specification:Figure 1 is a side e evation, partly in section, illustrating a screwthreading machine constructed in accordance with our invention. Fig. 2is a transverse verticalsectional view on the die-holders. or slides,including the means for adjustably securing the cutting-'die thereto.

Figs. 9 and 10 are detail views of the securing-bolt and rack-platewhich constitute the means for adjustably securing the cuttingdiesto theslides. Fig. 11 is a rear view of one pf the cutting-dies, showing theAbolt -opemng and recess which receive the securing-bolt. Figs. 12 and13 are enlar ed views of modified forms of cutting dies. ig.v 14 is aside view illustrating certain parts of the die head and the means forautomaticallyseparating the cutting-dies. Fig. 15 is a front view\ ofthe parts shownA in Fig. 14.

Fig. 16 is a plan view of the devices em-,l

ployed for automatically separating the cutting-dies. Fig. 17 is adetailview of the trip ing dog which isadapted to automatica lever hereinafterreferred to.

y engage and hold the yoked shifting Like numerals of reference indicatelike parts in all the figures of the drawings.

In carrying out our invention the frame 1 of the machine may be of anyapproved design to provide suitable bearings for the operating shafts,and includes a table 2 upon which moves the carriage 3 for holdin andfeeding the stock to the dies. The ta le 2 is provided with the usualtracks or waysv 4, upon which the carriage slides.

We lay no claim to novelty in the construction of the carriage, andtherefore any form of such device may be employed, the one shown beingof an ordinary type and comprises the connected slides 5, theclamping-head 6 in which the stock is held, and the operating pinion 7mounted on a transverse shaft 8 to the outer end of which is attachedthe hand-Wheel 9, said pinion engaging a longitudinal rack-bar 10supported at the center of the table- 2 between 'the tracks. The slides5 of the carria e are provided with the usual depending anges v whichbear against the inner edge of the tracks, and to which flanges areattached plates 11 bearing against the underside of the tracks, wherebythe carriage is held iuclose slidable engagement with the tracks. One ofthe slides of the V carriage is recessed longitudinally immediatelyabove the plate 11 so as to receive av bar 12 adapted to operate theautomatic shifting devices hereinafter described, and said bar isadjustably secured in the carriage by means of the set-screw 13.

Mounted in the frame of the machine, inV the bearings 14, is ahorizontal spindle 15 to the front end of which the die-head isconnected, and loosely mounted upon said spindle, between the bearings,is a cone-pulley 16 to the rear end of which is attached a pinion 17,while upon the spindle at the front end of the pulley is fixed agearwheel 18. The pinion 17 is in mesh with a gearwheel 19 at the rearend of a sleeve 20 mountedon a horizontal shaft 21 located below thespindleand 10o journaled in bearings 22 on the frame. At the front endof the sleeve 20 is apinion 23' which is in meshv with the gearwheel'18. The cone-pulley, gearwheels and pinions just described constitutethe driving gear for the 105 spindle so as to reduce the speed of thelatter with respect to the driven cone-pulley; it being understood thatthe driving-belt asses over the pulley and the pinion 17 attac ed'toVthe latter being in mesh with the large gear- 11o 45 of the cam-block,as at 25a, to permit of a -rearward movement, of said block. These wheel19 on the sleeve 20 turns said sleeve slower than the pulley, and theformer bein eared to the spindle by the pinion 23 an arge gearwheel 18the speed of the gearing is still further reduced at the point ofconnection with said spindle. and 18 are preferably covered by a shield24, which protects themA from dirt. It will be noted that this drivinggear is all mounted within the frame of the machine, the counter-shaft21 being 'hung below the spindle or main driving shaft, thus producing acom-I pact arrangement and providing that the gears may be properlyprotected.

j The. forward end of `the spindle 15 is threaded to receive thedie-head 25 which issecured thereto, being screwed up against 'anannular flange 15a formed on said spindle,

, and this die-head is provided with several radially ,disposed recessesor slide-ways 26 (Fig. 5), in which are. slidably-mounted'acorresponding number of die-holders or slides.

27, the inner ends of the latter being beveled in op osite directions sothat they may be broug tclose together at the center of the ,inclinedsurface 32 terminating at its sides in d'ovetailed recesses, and mountedto slide upon this inclined surface is a' cam-block 33 havin p dovetails34 en agin the correg g il@ spondmg recesses aforesaid; reby when saidblock is moved back and forth it will impart aradial movement tothedie-holder or slide. The die-head is cut away in rear cam-blocks aresecured .byscrews 35 to the inner side of a ring 36 which embracesthedie-head and has a flange 36a bearing upon the rear or hub portion ofsaid die-head and- 'adapted to slide thereon'. The iiange 36a-isprovided with an annular groove which receives the inwardly projectlngflange 37a of a rotatable ring 37, the latter llange being held inrotatable engagement with the ange of the ring 36 b means of an annularplate 38 1 secured to sai last mentioned Han e.

The ring 37 is provided with an interna thread 37b enga m a correspondinthread on a ring 39, w ic latter is rotatab y and slidably v mounted onthe cylindrical ortion of abearing-block 40 secured to the rame of themachine bythe screws 40a, said block also forming one'of the bearingsfor the spindle.

The gearwheels 17 l dles 37".

an upwardly projecting flangey 39hto which is secured a coverlng band 39a said band overlapping the rear end of the ring 37 and is provided witha set-screw 42 adapted to impinge upon said ring and hold it againstrotation u on the ring 39. v

` It will e. understood that the ring 36 which carries .the cam-blocksrevolves with the die-head, while the ring v37y which is clamped betweenthe rings 39 and 39a're- 'mains stationary with said rin s,so that theaforesaid ring 36 and its cam-b ocks are held in an adjusted relation tothe die-holders' or slides 27, and the latter hold the cutting-dies' inan adjusted-position with respect to thev j The ring 39 is provided atits rear endwith l sol axis of the die-head. N ow by loosening theset-screw 42 and turning'the threaded ring 37 in either direction saidring is shifted back or forth` by reason of the engagement of the threadthereon with the thread of the stationary ring 39, and as 'said ring 37carries with it the ring 36 the cam-blocks which are secured to' theIlatter will adjust the dieholders or slides 27 either toward `or fromthe axis of the die-head, according to the direction the ring 37 isturned. Thls ring is I therefore operated to adjust the dies to thesizeof the stock, and ofcourse may be turned while the die-head isrevolving. 'After' properl settingthe dies the operating ringv 37 isI hed fast by means of the set-screw 42.v For convenience in turning thisoperating ring 37 it is providedV with a suitable number of hant Now forthe purpose of separating the out ting dies to release the rod or boltafter it is threaded the connected rings 39 and 39a are ishiftablelaterally upon thecylindricalpor# tion of thebearing 40, and of coursethis may be done either manually or automatically,

-the devices for accomplishing this operation4 being hereinafterdescribed.

It willbe s een of course that when the connected rings 29 and 39.L areshifted rearward they willimpart arearward movement tothe ring 36,'thecam-blocks riding uponthe inclined surfaces of the die-holders or slides27 will move the latter towards the center of the die-head or inposition to cut a thread upon the size of rod or bolt for which themachine has -been adjusted by turning the ring 37 upon the ring 39. Whenthe thread is cutV a forward movement ofthe connected rings 39 and 39awill impart a forward movement to the rin s 37 and 36, and to thecam-blocks 33, and t e latter will draw the die-holders 1 l or slides 27outward, thereby'separating the l i i dies and releasing the threadedrod or bolt so ,f

` that it may be readily withdrawn from the die+head. Of course only! a.slight movement of the parts is required to separate the diessufficiently to release thel threaded rod or' bolt, ,and' this manner ofoperating the die-- holders or slides ,does not disturb the adjusttingface 45 having the usual cutting-teeth.,

In this manner -a plurality of separate cuttin-g faces are provided oneach die, and so that when one is worn another may be brought intooperative position, and so on until all the thread-cutting faces havebeen used. To hold this die in fixedengag'ement with the` die-holders orslides y27, and at the Sametime rovideV that the several cutting facesmay e brought successively in operative position, certain devices areemployed,

consisting of an adjusting bolt 46 and means for securing the same. 'Iheshoulder of the bolt is flattened at ropposite sides, as at 46a (Fig.9), and inthe rear of the die is a corre- Sponding recess, .43 a, toreceive this part of t e shoulder and so that the die will not bepermitted to turn on the bolt, being held in engagement with theflattened shoulder by means of the nut 47. Now to adjust the die j tobring any one of the cutting faces inoperthe bolt andv cuttin ativeposition it lis onlynecessary to turn the bolt, and in order thereforeto hold the bolt from turning after being once adjusted said bol-t isprovided with an annular series of teeth 48 which are adapted to engagethe teeth of a segmental rack-plate 49, the latter' being secured to thedie-holder or slide 27 as shown in Fig. 7 of the drawings. To receivethe toothed portion of the bolt, as well as the segmental rack-plate,the die-holder or slide is recessed in its rear side, and said recess ispreferably covered by means of a plate 50,'

(Fig. 8). It will be noted that in adjusting loosened and the bo t 46then pushed rearward until the teeth 48 are beyond the toothedrack-plate 49. The bolt and cutting-die can now be turned to bring thedesired cut-- ting face int-o operative position, after which the nut 47is screwed up which will bring the teeth of the bolt into engagementwith the teethof the rack-plate, ,thereby holding the bolt, againstturnin In order that the cutting-die may be he d snugly up into therecess of the die-.holder during the adjustment of the same a coiled slring 51 is attached to the bolt and to the p ate 50 (see Fig. 8), sothat when the nut 47 1s unscrewed or loosened the bolt will be drawnrearward by the spring until it disengages therack, and during thismovement the nut pressing against the 'die will hold the latter upagainst the die-holder .plish this automatically insures -die the nut 47is first or slide, thus preventing any dirt or cuttings V getting inbetween the die and the slide. The nut 47 has a narrow s uarc portion for the engagement of the usu.V wrench, and the required thickness forthe thread is provided for by having an integral collar portion 47, thelatter fitting into a recess in the front of the cutting die, as shown.In this manner the nut projects only a slight distance in front of thedie, so that in threading a bolt the head of the latter may be broughtclose up to the dies.

In Figs. 12 and 13 of the drawings we have shown modifications of thecutting die here inbefore described. In Fig. 12 a large number ofprojections 52 are formed and se Aarated by V-shaped recesses 52a, thecutting faces or teeth being formed on the outer edge of saidprojections, as in the case of the die 43. In Fig. 13the cylindricalbody 53 of the cutting-die is provided in its circumference withtransverse grooves which receive blocks 54 which have the cutting facesor teeth, said blocks being held rigidly in place by means of pins 54a.vIn this manner when the cutting faces or teeth of all the blocks areworn the die maybe removed and the blocks renewed by inserting anotherset. In this case itis only necessary that the blocks `be made of toolsteel, and the body of the die may be -made of softer steel. In bothmodifications,

with the recesses necessary to receive the securing bolt and nut.

As f' heretoforeA stated the dies may be opened and closed for.releasing the threaded rod or bolt and again -bringing them intooperative position by operating the ring 39 either manually drautomatically through the intervention of \the carriage which feeds therod onbolt to the die-head. To accom rod or bolt will be threaded for acertain part of its length, and we have therefore provided certainautom-atie devices which we shall now proceed to describe.

In the first place the ring 39 is provided that each with a cam-slot'55into which projects the head of a screw 56 threaded into the stationarybearing-block 40, whereby when the ring 39- is turned it will be shiftedlaterally a short distance or sufficiently to open the dies thereqkuiiled distance to release the threaded rod o t. Formed on the lowerend of the art 39a of the ring 39 is an enlargement or oss 57 to whichis secured a. late 58 having an ear to which is pivotedja link 59connected to a lever 60, the latter being pivoted to a bracket 61 boltedupon the table 2. This lever provides the means for manually turningAthe connectedrings 39 and 39a. Also pivoted to the ear on the plate 58is a link 62 which is lconnected to a tappet-lever 63 pivoted in abracket 64 bolted at the other side of the table from lever 60, said ta)pet-lever having a downwardly and forwardly projecting inember 63awhich is operated upon by a tappet 65 projecting from a grooved wheel66, the latter being splined upon thepcounter-shaft 21 which forms partof the drivinggear. Enciicling the grooved tappet-wheel 66 is a yokedlever 67 which is hinged at one end on. a bolt 68 depending from one ofthe tracks of the table, and at its other end is curved upwardly so asto be engaged by a dog 69 ivoted to the under side of the other trac: ofthe table. The yoke portion of this lever is provided with pins 70 whichengage the groove in the tappet-wheel, and the lever is movablelaterally so as to shift the tappetwheel and bring the tappet or in 65in and out of operative relation with t e tappet-lever. The yoked leveris provided near its pivot end with a cam pro'ection 71, one side ofwhich is beveled or inclined, as shown, and upon thiscain-projectionrides a in 72 projecting from the ring 39 39a, wiich pin is adapted toshift the yoked lever rearward so as to beengaged by the dog and holdthe tapet out of operative relation to the tappetever 63.

The yoked lever is actuated in one direction, or forwardly, to move thetappet-wheel in operative relation to the tappet-lever by means of anexpansion spring 73 (Fig. 16), which spring is inteiposed between theyoked lever and frame of the machine.

The dog or catch 69 is pivoted to the underside of one of the tracks ofthe table 2, as shown in Fig. 16, and the end which engages the yokedlever is beveled so that the latter may automatically engage the same,the catch or dog being actuated by a s ring 74. In order to rovide forautomatical y releasing the 4ca-tc i or dog it is provided at its ivot.

end with a projection 75, which extent s be. yond the inner edge of thetrack and in the path of the bar 12 on the carriage. This projection isformed with an upwardly projecting boss or shoulder 76 which abutsagainst the track and limits the throw of the dog. It will be seen thatthe bar 12 is adapted to automatically trip the dog or catch when thecarriage is moved towards the die-head a certain distance, and that whensaid dog is tripped the yoke is released and actuated by the spring 73to move the tappet-wheel so that the ta pet or pin thereon will engagethe tappetever 63. It will also benoted that the outer end of thetappet-lever is of such width that should the tappet-wheel be shiftedforwardly when the pin is in its lowermost position the outer end ofsaid pin will ride upon the inner side of said lever until it movesbeyond the upper edge of the lever, and so that it will engage saidupper edge upon its next revolution.

the position they occu(py when the dies are open. To close the ies thelever 60 is ushed forward which turns the ring 39 and by reason of thecam-slot 55 and in 56 said ring is moved rearward carrying t e rings 37and 36, the latter closing the dies through the intervention of thecam-blocks 33. In this position the pin 72 will not interfere with theforward movement of the yoked-lever when the dog is tripped. Now whenthe rod or bolt is threaded to such an extent that the bar 12 contactswith the dog 69 the latter is tripped and releasing the yoked lever 67the latter is moved forwardly by the action of the spring 73 andimparting a corresponding movement to the tappet-wheel the pin on thelatter will engage the tappet-lever 63 and operate the same so as toturn the ring 39 and open the dies. It will be seen therefore that thisoperation is entirely automatic. If at any time during the operation ofthreading a rod or bolt it is desired to open the dies the catch or dog69 may be tri ed manually by operating the lever 77. Iiil'lien theyokedlever is engaged by the catch or dog, as shownin Fig. 15, the die'smay be opened and closed by simply manipulating the lever 60.

From the foregoing description the -construction, operation and racticaladvantages of our invention will Ee readily understood. y

Having described' our invention, what we claim is .y

1. In a screw-threading machine, the combination with the die-head havinradial recesses or ways', of die-holders slida ly mounted in saidrecesses or ways, means for radially moving the\'dieholders, a shiftablering attached to said means, a threaded ring rotatably engaging theshiftable ring, a threaded ring with which the thread of the rotatablering engages, means for locking said rings together, and means formoving them laterally. l

2. In a screw-lthreading machine, the com bination with the .die-headhaving a rear.- wardly-projecting hub .and radial recesses or ways inits face, of die-holders slidably mounted in said recesses'or ways,means for radially moving the die-holders, a laterally shiftable ringconnected to said means and having a flan -e slidable upon the hub ofthe die-head, sai( flange having an annular recess, a ring having aninwardly-projecting flange rotatably engaging the annular recess orchannel and provided with a thread,

a band shiftabl mountedon a fixed su port gaging the inclined surfacesof the die-holders, a laterally movable ring to which Athe cam-blocksare secured, a ring rotatably engaging the laterally movable ring andhaving a thread, a ring shiftable laterally upon a support and having athread with Which the thread of the rotatable ring engages to adjustsaid rotatable ring laterally, means for lock-l ing the threaded ringstogether, and means for operating the shiltable ring.

4. In a screw-threading machine, the combination with the die-headhaving a Workopening, of die-holders mounted in the diehead and movableWith respect to the Workopening, a laterally movable ring andconnections for moving the die-holders, a ring rotatably engaging thelaterally movable ring, a stationary support, a ring shiftable laterallyupon the support, and connecting means operative upon rotation of therotatable ring for adjusting the relative positions of the shiftable androtatable rings, substantially as shown and for the purpose set forth.

5. In a machinebf the character described, the combination with a slidehaving a bolthole therein, a bolt slidably engaging the bolt-hole in theslide and having teeth at one end and threaded at the other end, a,multiple die connected to the bolt and rotatable therewith, a rack-platesecured 'to the slide and with Which the teeth 'on the bolt slidablyengage, and a nut threaded on the other end of the bolt to clamp theparts together.

6. In a machine of the character described, the combination With adie-holder having a bolt-hole, of a rotatable multiple die having abolt-hole and a recess at one end thereof communicatin With saidbolt-hole, a bolt adapted to sli ablyengage the bolt-holes in thedie-holder and die and having a portion engaging the recess in thelatter, teeth on said bolt, and a rack-plate secured to the dieholderand With Which theteeth on the bolt enga e by a slidable movement of thelatter.

7. n a machine of the character described, the combination with adie-holder having a bolt-hole, of a rotatable multiple cutting-diehaving a bolt-'hole therethrough and a recess at one end communicatingWith said bolthole, a bolt adapted to slidably enga e the bolt-holes inthe die-holder and die an having a portion engaging the recess in thelatter, teeth on said bolt, a fixed rack-plate with which the teeth areadapted to engage, a spring adapted to move the bolt out of engagementWith the rack-plate, and means for holding the bolt in engagement withthe rack-plate.

8. In a machine ofthe character described,

the combination with a die-holder having a bolt-hole, of a multiple diehaving a bolt-hole therethrough and a recess at one end communicatingwith said bolt-hole, a bolt ada ted to slidably engage the bolt-holes'in t e die-holder and die and having a portion engaging the recess inthe latter, said bolt be,

ing threaded and provided with circumferential teeth, a racklate securedto the dieon the olt to cause the engagement of thev teeth With therack-plate.

9. In a machine ofthe character described, the combination with adie-holder having a bolt-hole, of a multiple die having a bolt-holetherethrough and a recess at one end communicating with said bolt-hole,a bolt adapted to slidably engage the bolt-holes in the die-holder anddie and having a portion engaging the recess in the latter, said boltbeing threaded and provided With circumferential teeth, a racklatesecured tothe dieholder and With Which the teeth on the bolt are adaptedto enga e, a spring connected to the bolt and ada te to move the sameout of engagement Wit the rack-plate, and a nut threaded on the bolt tomove and lock the same in engagement With said rack-plate, substantiallyas shown and described. 10. In a machine of the character described, thecombination with a die-holder having a bolt-hole countersunk at itsinner end forming a cavity, of a multi le die having a bolt-holetherethrough an a recess at one end communicating with said bolt-hole, abolt adapted to slidably engage the boltholes in the die-holder and dieand having a portion engaging the recess in the latter, said bolt. beingthreaded at its outer' end and provided with circumferential teeth atits inner end, a rack-plate secured in the cavity in the die-holder sothatthe teeth on the bolt may engage therewith, a covering-plateVsecured to the die-holder over the cavity, a spring connected at oneend to the coveringp ate and at the other end to the bolt and adapted tomove the latter out of engagement with the rack-plate, and a nutthreaded on the outer end of the bolt against the face of the die andadapted to move the bolt in enas shown and described.

11. In a screw-threading machine, a laterally movable die-controllingring and mechanism for moving it comprisin an o erating lever connectedto said ring, a atera y movable tappet-Wheel having a tappet adapted tooperate the lever, driving-gear for rotating the tappet-Wheel, and meansfor moving the tap et-Wheel in and out of operative relation to t elever, substantially as shown and described.

12. In a screw-threading machine, a laterally movable die-controllingring and mechanism for moving it comprising an o erating lever connectedto the ring, a rotata le shaft and means for turning the same, a tapWheel splined to and slidable upon said s aft and having a tappetadapted to operate the lever when said wheel is moved to one of its etvt said tappet -wheel in the other direction against the .action of thespring, substantially as shown and described.

13. In a screw-threading machine, a laterally movable die-controllingring and mechanism for moving-it comprising an operatin lever connectedto the ring, a shaft an means for rotating thesame, a tappet-Wheelsplined to and slidable upon said shaft and having a tap et adapted tooperate the lever When said W eel is moved to one of its positions, aspring for moving the tappet-Wheel into operative position with respectto the lever, means for moving the tappet-Wheel into an inoperativeposition against the action of the s ring, and a catch for holding thetappet-Whee in the latter position.

14. In a screw-threading machine, a laterally movable die-controllingring and mechanism for moving it comprising an operatin lever connectedto the ring, a shaft an means for rotating the same, a tappet-Wheelsplined to and slidable upon said shaft and having a tap etadapted tooperate the lever when said Wheel is moved to one of its -positions, aspring for moving the tappet-Wheel into operative position wlth relationto the lever, means for moving the tappet-Wheel into an inoperativeposition against the action of the spring, a catch for holding thetappet-Wheel in lthe latter position, and

means for releasing said catch, substantially as shown and described.

15. In a screw-threading machine, a laterally movable die-controllingring and mechanism for moving it comprising an operatin lever connectedto the ring, a shaft an means for rotating the same, a tappet-wheelsplined to and slidable upon said shaft and having a tappet ada ted tooperate the lever when said tappeteel is moved to one of its positions,a shifting lever connected to the.

tap et-Wheel, a spring vfor actuating the s ting-lever in one direction,means for actuating said lever in the other direction, a

means for rotating the same, a ta pet-Wheel splined to and slidable uponsai shaft and having a tappet adaplted to operate the lever when saidtappeteel is'moved to one of its positions, a spring adapted to move thetappet-Wheel into operative position with relation to the lever, meansoperated by the shiftable ring for moving the tappet-Wheel out ofoperative position With relation to the lever, a catch for holding thetappet-Wheel in the latter position, and means for releasing the catch,substantially as shown and described.

17. In a screW-threadin machine, a laterally movable die-controllingring and mechanism for moving it comprising an operating lever connectedto the ring, a shaft and means for rotating it, a tappet-Wheel splinedto and slidable upon said shaft and vhaving a taplpetadapted, to operatethe lever When sai tappet-Wheel isy moved`to one of its positions, ashifting-lever connected to the tappet Wheel and having acam-projection, a spring actuating said shifting-lever to move t e -tapet-Wheel into operative position With re ation to the lever, a in onthe aforesaid shiftable ring adapte to engage the. camprojection of theshifting-lever and move the ta pet-Wheel to an inoperative position, acatcIi adapted to engage the shiftinglever when moved to the latter.position, and means for releasing. said catch. l

' In testimonywhere'of We have signed our names to this specification inthe presence of tWo subscribing Witnesses.

JOSEPH O. DIXON ERVIN S. MUMMERT.

